Magnetism. A magnet being used to separate iron filings from finely crushed sulphur. The iron filings,being a magnetic material,stick to the magnet while the sulphur,being non-magnetic,doesn't | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 4500 px × 4500 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |